Design method of equal life on detonation combustor under actual detonation loading

According to the equal wall thickness detonation combustor of 60mm inner diameter, the finite element model was established and the real detonation load was applied. The fatigue load spectrum was confirmed as a constant amplitude spectrum. The relationship between the wall thickness and the dynamic magnification factor of detonation combustor was found by calculating analytical model under static loading and finite element model. The wall thickness adjusted itself through the dynamic magnification factor. In the process, target stress was approached by the equivalent stress of the inner wall. On this basis, the design method of equal life detonation combustor was presented. According to the calculation results, the test section of the variable wall detonation combustor was designed and processed. The strain of three measuring points on the outer wall of variable wall thickness was measured; the fatigue life of the inner wall of these three measuring points was estimated, and the maximum error of the fatigue life was 8.82%. Considering the working conditions' error between the test and numerical calculation, the life of these three measuring points was the same, proving the validity of the design method of equal life detonation combustor.